Alibaba Exam ACA-Operator Topic 5 Question 53 Discussion

Actual exam question for Alibaba's ACA-Operator exam

Question #: 53
Topic #: 5

When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)

AAdd an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

BApplies indices to fields to contain many records.

CA table should not contaiiAiore than 6 indexed fields.

DApply indexing to fields of fixed length (preferably not long fields).

EAdhere to the rightmost prefix principle when using composite indexes

Show Suggested Answer

Suggested Answer: A, C, D

by Donette at Feb 13, 2024, 03:42 PM

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Sarah

7 months ago

I think adhering to the rightmost prefix principle with composite indexes is crucial for optimizing query execution.

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Luther

7 months ago

I also believe option D is important. Indexing fields of fixed length can make searches more efficient.

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Heidy

7 months ago

I agree with Mose. Adding an index to a frequently queried field can really speed up database operations.

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Mose

7 months ago

I think option A is definitely a best practice when creating database indexes. It helps improve query performance without impacting data modification operations.

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